Tme nohbis peters co



3 Sheets-Sheet 1.

(No Model.)

` RMOHLER.

SMOKE GONSUMING FURNAGE.

Patented May 30, 1893.

lill

(No Model.) v 8 Sheets-Sheet 2.

` 41 Y.MOHLBR. SMOKE CONSUMING IEURNAGB.v

No. 498,284. PatentedMay 30, 1893.

' UNITED STATES PAT'EAVFv FFICE.

PAUL MHLER, oF soHwBIsorr GMND, GERMANY.

SMOKE-c oNSiUMlNG FURNACE.

SPECIFICATION forming part of Letters Patent NO. 498,284, (lated May 30,1893. Application filed August Y24, 1892. Serial No. 443,985. (Nomodel.)

. ing Furnaces,of which the following is a specification.

This invention consists of a smoke-consuming furnace for. steam-boilersprovided with' feed-water heaters. i

The invention is shown in the accompanying drawings.

Figure 1 is a longitudinal section, Fig. 2 a cross section and Fig. 3 aplan View of the smoke-consuming furnace, while Figs. 4 and 5 are a sideview and plan view respectively in section of a modified construction ofthe grate.

There is provided'on the front side of the boiler a boiler a of smallersize, preferably pear-shaped, connected by tubes both with the upper ormain boiler and with the feedwater heaters. The Water-chamber ofthisboiler is intersected or divided by the flue b .leading to theheating tubes ofthe boiler.

Its lower part is surrounded by a basketshaped grate c (see Figs. 1, 2and 3), whileits upper part is surrounded by a casing or jacket d,terminating at the top in a tube through which the admission of air iscontrolled by suitable devices. This casing cl surrounds the coalreservoir or magazine from which fuel is automatically supplied to thefire by simply sliding down on to the grate. Suitable peep-holes such asshown in Fig. 4 mayV be provided in this coal-box. The grate in theshape of a basket or cage is erected on uprights or feet upon themasonry and traversed at its lower end by a preferably cylindrical tubee of fire-brick or iron, the orifice ot' which is surmounted by a doublecone f. If preferred the inclination of the grate may be steep and itsbars so arranged on a curved line as to surround the lower portion ofthe boiler (see Figs. 4 and 5), its bottom being formed by aslightlyinclined grate sufficiently distant from the upper part to allowof the ready removal of clinkers, ashes and the like.

Atmospheric air is conveyed to the fire through the cylindrical tube eand for this purpose the said tube is connected by a pipe g with anair-channel h. By means of a piston g operated by a horizontal spindleor if preferred bya suitable valve or damper operated from outside (seeFig. 4), the extent to which the orifice connecting the tube with theair channel is opened or closed, may be suitably adjusted. Theair-channel h may be arranged within the heating tube or flue of asuperheater (Fig. 2) and may be covered with iron plates, whereby theatmospheric air is subjected to a preliminary heating operation. The airthen passes into the cylindrical tube surroundedon all sides byincandescent fuel and itself heated to incandescence so that the air ishere brought to a Very high temperature. In order still further to raisethe telnperature-of the air, metal plates g2 (Figs. 4 and 5) may beinserted into the tube at predetermined intervals apart, and in aposition parallel to the longitudinal axis of the tube. In this highlyheated conditionthe air through the medium of the double cone-shapeddome surmounting the tube is uniformly diffused in all directions as itissues from the latter, and passing into the furnace it there thoroughlymixes with the products of combustion rising from the grate so that thesmoke from the fuel iscompletely consumed or burned, along with the fuelitself. This effect may all the more securely be relied upon, as theproducts of the distillation of coal are compelled constantly to flowover and in contact with the incandescent surface of the fuel upon thegrate, so that their heat is considerably added to by that of the airwith'which they are thus caused to mix. The full benefit is thereforederived from the fuel employed, since only just sufficient air isadmitted to assist combustion and such air does not arrive in a coldcondition; condensation from cooling is therefore entirely avoided, asis also any esca-pe of unburned particles.

Owing to the connection of the grate with a secondary or smaller boilera connected with the main boilers, the heating of the boiler-water andconsequently the production of steam are accelerated, as the volume ofwater in the boiler directly overlying the furnace rapidly becomesheated to a high temperature and imparts this heat to the feed water inthe IOO boiler and superheater. It will also be seen that in thisarrangement of furnace full advantage is taken of the radiating heat.

I claim- 1. In combination in a furnace, the main boiler, the drum a, orsupplemental boiler arranged below the same, the flue b, extendingthrough the said drum and intersecting the same and the gratesurrounding the drum,`

substantially as described.

2. In combination in a furnace, the main boiler, the supplemental boileror drum a, below the same, the iue b, extending through the said drum,the basket shaped grate about the drum, the air tube e, projecting up tothe mouth of the iue Z9, and the air channel 7L,

leading to the said tube, substantially as de-A

